Can you identify them all? I'm not gate keeping, I put some tricky ones in there as a joke for myself and I hope you might enjoy the puzzle. I can confirm any correct answers.
Sorry, didn't see this reply until now. I don't know all of them for sure (especially the few that look like really old Cherry like the MY and M9?), but own or have owned a quite a few of these. I parted with a bunch of my collection when I moved states last year, but still have several old boards that have SKCM Alps, vintage Cherry MX, and my clicky space invaders and some not pictured like my SMK Cherry MX mount and a few Model F and Model M.
There are so many mitsumis and it shouldn't surprise me that I don't know them all (they seriously are all over the place). I am now in the midwest, so we probably won't run into each other.